Table des Matières
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GENERAL
Water heater maintenance includes inspection and testing of the
Temperature Pressure Relief Valve, periodic tank flushing and
cleaning, and removal of lime scale from the heating elements.
Where used, water heating system circulating pumps should be
oiled.
Tank flushing and element maintenance should be performed
in accordance with the maintenance schedule. See Table 10.
Tank sediment removal and element lime scale removal must be
performed when needed as determined by periodic inspections.
ANODE ROD INSPECTION AND REPLACEMENT
This water heater is equipped with a non sacrificial powered anode
rod and a sacrificial anode rod. Sacrificial anodes protect the
glass lined tank from corrosion by sacrificing themselves through
electrolysis. When the anode material is consumed, there is no
more protection and corrosion of the tank accelerates. Powered
anode rods are non sacrificial and should not need to be replaced
unless damaged.
Inspection of the sacrificial anode rod every 6 to 12 months allows
you to identify a spent anode and replace it. Replace the anode
rod when its diameter is 3/8" (1 cm) of an inch, or annually which
ever is first. Aggressive, very hot and softened water causes rapid
consumption of the anode rod requiring frequent inspections. Call
the toll free number on the back cover of this manual for information
on obtaining replacement anode rods.
TEMPERATURE-PRESSURE RELIEF VALVE OPERATION
The temperature-pressure relief valve must be manually operated
at least once a month. Lift the lever at the top of valve several times
until the valve seats properly and operates freely. See Figure 13.
When checking the temperature-pressure relief valve operation,
make sure that (1) no one is in front of or around the outlet of
the temperature-pressure relief valve discharge line, and (2) that
the water discharge will not cause any property damage, as the
water may be extremely hot. Use care when operating valve as
the valve may be hot.
Figure 13. Temperature-Pressure Relief Valve
If after manually operating the valve, it fails to completely reset
and continues to release water, immediately close the cold water
inlet to the water heater, follow the draining instructions in the Start
Up section of this manual, and replace the temperature-pressure
relief valve with a properly rated/sized new one.
If the temperature-pressure relief valve on the water heater weeps
MAINTENANCE
or discharges periodically, this may be due to thermal expansion.
Consult your local water supplier or a Qualified Service Agency
for further information. Do not plug the temperature-pressure
relief valve.
Component
Tank
Elements
FLUSHING
The water heater drain valve should be opened periodically to
help prevent sediment buildup on the tank bottom.
1.
Turn off the electrical disconnect switch.
2.
Open a nearby hot water faucet until the water is no longer
hot, then close the hot water faucet.
3.
Attach hose to outlet opening of drain valve and direct end to
drain.
• Open the drain valve by turning the hand wheel to the
left (counterclockwise). Allow water to flow until it runs
clean.
• If water does not flow from opened drain valve, follow
instructions for sediment removal.
4.
When finished flushing:
•
Close heater drain valve and remove hose.
•
Turn on electricity.
SEDIMENT REMOVAL
Water borne impurities consist of fine particles of soil and sand
which settle out and form a layer of sediment on the bottom of the
tank. In time, if not removed, the level of sediment might reach
the heating elements and cause their failure.
For convenience, sediment removal and element lime scale
removal should be performed at the same time as follows.
LIME SCALE REMOVAL
Lime scale accumulations on the heating elements is a normal
condition, common to all immersion type elements. Factors which
affect the amounts of this formation are:
1.
Amount of hot water used. As the volume of the water heated
increases, more scale results.
2.
Water temperature. As the temperature of the water is
increased, more scale is deposited on the elements.
3.
Characteristics of water supply.
Regardless of water treatment, the elements should be
examined regularly.
Lime scale accumulations may cause noises to occur during
operation.
It is recommended that a heating element be removed periodically
for examination. If it is scaled, all of the elements should be
removed and cleaned. If the tank bottom has an accumulation of
sediment it should be cleaned.
Lime scale should be removed by dissolving the accumulation in
30
Table 10. Maintenance Schedule.
Operation
Interval
Flushing
Monthly
Sediment
As Needed
Removal
Lime Scale
As Needed
Removal
Required
UN-LIME
delimer and ele-
ment gaskets
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Table des Matières
